Elements Compounds Mixtures

Question 1

What is matter

Answer 1

anything that has mass and occupies space

Question 2

What is chemistry

Answer 2

the study of matter

Question 3

What is matter made of

Answer 3

elements compounds mixtures

Question 4

What are the particles of matter

Answer 4

atoms molecules ions

Question 5

What is an atom

Answer 5

the smallest particle that a substance can exist in

Question 6

What is a molecule

Answer 6

a group of two or more atoms chemically combined together

Question 7

What is a diatomic molecule

Answer 7

a molecule consisting of two atoms chemically combined together

Question 8

What is a polyatomic molecule

Answer 8

a molecule consisting of three or more atoms chemically combined together

Question 9

What is a triatomic molecule

Answer 9

a molecule consisting of exactly three atoms chemically combined together

Question 10

Do molecules need to be made of same atoms

Answer 10

no they can be made of different types of atoms

Question 11

What is an element

Answer 11

matter in its simplest form made of the same type of atoms cannot be broken down by chemical methods

Question 12

What are chemical symbols

Answer 12

unique symbols to represent elements only the first letter is capitalised

Question 13

What are atoms of elements

Answer 13

atoms of one element differ from another some exist as individual atoms such as metals and noble gases called monatomic elements

Question 14

What are molecules of elements

Answer 14

some elements exist as molecules of two or more of the same atoms chemically combined

Question 15

How are atoms and molecules represented

Answer 15

atoms by chemical symbols molecules by chemical formulas

Question 16

How are elements classified

Answer 16

into metals and non metals by physical properties

Question 17

What are properties of metals

Answer 17

shiny solid at room temperature high melting and boiling point good conductor of heat and electricity ductile and malleable

Question 18

What are properties of non metals

Answer 18

dull solids gases or solids low melting and boiling point poor conductor of heat non conductor of electricity brittle

Question 19

What are the periodic table groups

Answer 19

group 1 alkali metals group 2 alkaline earth metals group 3 to 12 transition metals group 17 halogens group 18 noble gases

Question 20

What is a compound

Answer 20

a substance of two or more different elements chemically combined together formed by chemical reaction new substance formed

Question 21

Do compounds exist as molecules or ions

Answer 21

some exist as molecules some exist as ions

Question 22

What are properties of compounds

Answer 22

physical and chemical properties are different from its constituents elements always in fixed proportion by mass cannot be broken down by physical methods

Question 23

What are pure substances

Answer 23

made of one element or one compound

Question 24

What are impure substances

Answer 24

made of two or more substances mixed but not chemically combined

Question 25

What is a mixture

Answer 25

two or more substances mixed not chemically combined components not fixed can be any ratio

Question 26

What are properties of mixtures

Answer 26

retain properties of components no fixed proportion no chemical reaction easily separated by physical methods

Question 27

What are examples of mixtures

Answer 27

solid solid alloy solid liquid seawater liquid liquid soups gas liquid carbonated drinks gas gas air

Question 28

What is the test for pure solids

Answer 28

fixed melting point or melt at a fixed temperature

Question 29

What is the test for pure liquids

Answer 29

fixed boiling point or boil at a fixed temperature

Question 30

What is the test for impure solids

Answer 30

melt over a range of temperature

Question 31

What is the test for impure liquids

Answer 31

boil over a range of temperatures